Got a call from this number. No message left.
I tried calling it back and the line was busy.

Got a call from this number.  Recorded message said it was a call from my "credit card" and that there was no problem but that I was eligible for lowering my interest rates and to push a number on my key pad if I was interested but this was my last notification of my eligibility.  Too vague so I disconnected.

Got a call, couldn't answer and they didn't leave a VM. Tried calling back and the line was busy.

Got a call stating not a problem but wanted to lower my credit card interest rate.  When I got a person they stated banks I did not do business with and they hung up.  Yesterday received the same type of call from restricted number that stated a bank I do use and asked which card I used.  I said one that I KNEW I did not have and they stated I had a $4000.00 balance.  I said no I do not and they asked what my balance was.  I said you tell me and they hung up.  

Missed a call from this number, but I can tell by other peoples responses that it's a phishing scam.